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Congress Now Funding ‘Controversial’ Geoengineering ‘Plan B’ to Spray Particles in the Sky to Cool Earth

Published: January 27, 2020
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Source: science mag

The top climate change scientist for the National Oceanic and Atmospheric Administration (NOAA) said he has received $4 million from Congress and permission from his agency to study two emergency—and controversial—methods to cool the Earth if the U.S. and other nations fail to reduce global greenhouse gas emissions.

David Fahey, director of the Chemical Sciences Division of NOAA's Earth System Research Laboratory, told his staff yesterday that the federal government is ready to examine the science behind "geoengineering"—or what he dubbed a "Plan B" for climate change.

Fahey said he has received backing to explore two approaches.

One is to inject sulfur dioxide or a similar aerosol into the stratosphere to help shade the Earth from more intense sunlight. It is patterned after a natural solution: volcanic eruptions, which have been found to cool the Earth by emitting huge clouds of sulfur dioxide.

The second approach would use an aerosol of sea salt particles to improve the ability of low-lying clouds over the ocean to act as shade.

This technique is borrowed from "ship tracks"—or long clouds left by the passage of ocean freighters that are seen by satellites as reflective pathways. They could be widened by injections of vapor from seawater by specialized ships to create shading effects.

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